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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let apple = "苹果汁"
        let org = '橘子汁'
        let abc
        console.log(apple+org);
        abc=apple
        apple=org
        org=abc
        console.log(apple+org);
        console.log("苹果"+apple);
        console.log("橘子"+org);
    </script>
</body>
</html>